[CORD-3191] Remove old pmc-olt ref. Replace with voltha

Change-Id: I661c00526f377e99aac25037276019e1f724c36e
diff --git a/src/test/utils/Scale.py b/src/test/utils/Scale.py
index 3fd4e4b..6c14872 100644
--- a/src/test/utils/Scale.py
+++ b/src/test/utils/Scale.py
@@ -720,7 +720,7 @@
         #dids = OnosCtrl.get_device_ids()
         #device_map = {}
         #for did in dids:
-        #      device_map[did] = { 'basic' : { 'driver' : 'pmc-olt' } }
+        #      device_map[did] = { 'basic' : { 'driver' : 'voltha' } }
         #network_cfg = {}
         #network_cfg = { 'devices' : device_map }
         #Restart ONOS with cpqd driver config for OVS